REGULATORY ASSETS AND LIABILITIES REGULATORY ASSETS AND LIABILITIES 2 (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 49,792	$ 60,949
Excess Plant Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	38,430	40,029
Deferred Revenues - Net [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	19,067
Conservation Incentive Program Payable [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9,594	0
Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 1,768	$ 1,853